Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
va triet » va thiet, va trien, ve triet
van hanh » ban hanh, van anh, van ban
chat xuc » chat huu, cam xuc, chao xu
tu sach » thu sach, te sach, tu cach
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
su sach » so sach, vu sach
va chat » van chat, va phat, cao chat
ma hoi » mai hoi, xa hoi, ma hoa
vi va » vi van, vai va, vu va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (su sach)) ky nang ma hoi. hieu va chat xuc ((van hanh) or (van thanh)) vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang ma hoi. hieu va chat xuc ((van hanh) OR (van thanh)) vi va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky nang ma hoi. hieu va chat xuc ((van hanh) or (van thanh)) vi va triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky nang ma hoi. hieu va chat xuc ((van hanh) or (van thanh)) vi va triet*.